Mechanical preselector



E. J. MASTNEY MECHANICAL PRESELECTOR Filed Sept. 24, 1938 %2ae7zZ 07 iii ward c[% 50 ing primed numbers. Rotatively mounted on reinto .the saddle, the end thereof will engage shaft 50 I Patented Nov. 14, 1939 UNITED STATES PATENT OFFICE MECHANICAL PREsELEcTon Edward J. Mastney, Berwyn, Ill., assignor to Oak Manufacturing Company, Chicago, 111., a corporation of Illinois Application September 24, 1938, Serial No. 231,476 8' Claims. (01. 74-10) This invention relates to a mechanical preis a gear 42 provided with a finger 43 bent over selector particularly for use in a condenser drive to lie in the path of travel of finger 4i of'the on a radio receiving set although it is of genadjacent washer. eral application. In particular, this is an im- Sleeve 33 is similarly provided with a washer a provement upon the mechanism disclosed and and gear, all'correspondingly bearing the primed claimed in the patent to Edward J. Mastney No. numbers. 2,161,183, granted June 6, 1939. v Each unit is controlled by a pair of offset Referring to the drawing, racks 50 and 51 (see unit 28) engaging the gears Figure 1 is an elevation, partly in section, of 42 and 42' of each unit and disposed on opposite 1d a device embodying the improvement; sides of shaft I'I. These two racks are carried by Fig. 2 is a detail; and a lever 52. It is clear that upon downward move- Fig. 3 is a section on line 3-3 of Fig. 2. ment of the two racks, the two gears of a unit A base it .has mounted thereon a gang conwill be urged in opposite directions.v Assuming denser frame ll supporting stator plates l2. Rocenterwasher 30 is fixed relative to shaft ll,

l5 tatively mounted on frame It is a condenser shaft then each unit will tend to cause shaft H to wave [l3 carrying rotor plates M cooperatively assoto a predetermined position upon downward ciated with the stator plates. This gang con- .movement of the racks. This is more fully exdenser is an example of a device which is to be p ained in the patent referred to herein. turned to predetermined positions. The mech- In order to guide each lever and rack means,

g anism for doing this is mounted uponbase Ill and a top plate 55 is carried by side plates l5 and includes a pair of supporting plates I5 and l6 l6 as by ears 56. Plate 55 is slotted to journal bolted to base ll). lever 52. Additional strengthening members 51 Rotatively mounted in plates l5 and I6 is a and 58 extend between side plates I5 and HS to shaft l'l. One end of shaft ll is rotatively couprovide a rigid structure. Each lever 52 may have 5 pied to condenser shaft it by a suitable unia button 60 fitted thereon. versal joint means 08. Shaft ll is provided As' is evident, the operation of the device rewith sleeves l9 and Zll, both alike. As clearly quires that each center washer 3|] of a unit be shown, these sleeves have shoulder portions 2! fixed relative to shaft H. In addition, to preand 22 bearing on the inside faces of plates [5 select the stopping point for each unit, requires and it and in efiect constituting end thrust that each center washer be readily adjustable 30. sleeves. The shoulder ends of these sleeves are with reference to shaft IT. This is provided inthe preferably so fabricated as to provide a small following manner. annular clearance 23 around shaft ll. Between sleeve 20 and unit 29 are two large Between sleeves l9 and 20 are five identical washers GI and 52 loose on shaft l1. These two 5 control units 25-29 inclusive. Referring to unit .washersv are separated by a spring'washer 63'bent 29, as an example, there is provided a center so that this spring. washer may be compressed washer til-snugly fitting shaft I]. As shown in by forcing the two large washers together. Im-

the corresponding washer 30' of unit 28, the cenmediately beyond sleeve 20, shaft I! is mutilated ter washer is provided with a radially extend to provide two flats B5 and 65. At a short dising finger 311'. On opposite sides of center washtance from sleeve 20, shaft I1 is provided with a 40 er til are sleeves 32 and 33 having the same genpin 68 extending perpendicular to the flats 66 eral construction as sleeves l9 and 20. Thus and 61. Disposed around shaft i1 is a U-shaped sleeve 32 has a cylindrical portion 35 extending to I saddle member 69 having sides 10 and III eachproa shoulder 36 and then an enlarged cylindrical vided with a slot I2. It will be noted that slots 5 portion 31,. Enlarged cylindrical portion 31 is so 12 register and extend at an angle to the saddle shaped on the interior that an annular region arm length. Pin 68 extends through slots 12.

38 is provided around shaft Ii. Threaded into the base portion l3'of the saddle is I Sleeve33 is the image of sleeve 32 and is proan adjusting screw l4. vided with the same details carrying correspond- Obviously, as screw 14 is turned down deeper duced cylindrical portion 351s a washer 40 having I1 and tend to pull the saddle-out. The cam aca finger similar to finger ll on washer 40' of tion of pin 68 on slots 12 will therefore cause the unit 28. As clearly shown inunit 28, finger ll saddle to be displaced toward the left as seen in' is bent over to lie in-the path of travel of finger Fig. 2. This pressure will be exerted on the outer 5 ll of the center washer. Beyond this washer ll end of sleeve 20 and tend to move the various 5 the other units.

sleeves toward the other end sleeve I9. Hence the various sleeve-units will be tightened with the result that the center washers of each unit will be tightly retained in position. i To adjust the various units, screw 14 is withdrawn just enough to permit the various center washers to turnwith respect to shaft II. Then shaft-l1 is manually adjusted to a desired position by knob 15., In this position, the lever for a unit is operated while the operator hblds knob 19. Thus the center washer for a unit is turne tothe correct position fora certain shaft setting.

During this setting, the various adjusted units are kept in their adjustmentby the fact that there is enough friction between the center washer for an adjusted unit and the clamping. sleeves so that it will not change its position relative to the shaft unless forced.

. What is claimed is: I

1. In a device of the character described, a shaft, means normally rotatable with respect to said shaft but adapted to be clamped in adjusted position by side thrust, an adjustingmember on said shaft engaging said normally rotatable means to exert side thrust thereon, means tending to move said member perpendicular to said shaft aids, and means on said shaft engaging said member forcing said member to move parallel to said shaft "during the perpendicular motion thereof. Y

2. The structure of claim 1 wherein said adjust; ing-member comprisesa member disposed perpendicular to the shaft axis and wherein said last named two means comprise; cam and follower means on the shaft and member respectively to Y to force said U-shaped member to travel obliquely to said shaft upon application of a force thereto perpendicular to saidshaft.

4. In a device of the character described, the combination of a shaft,- means for rotatably' mounting said shaft, means on said shaft normally movable with respect thereto, and means for locking said normally movable means toa predetermined position on said shaft, said means in;

cludingthe following; an abutment atone portion of said shaft against which said normally ,movable means may be pressed, 'a cam and cam follower assembly on said shaft on the other side Thereafter the procedure is repeated for dicular to said shaft is carried by said member to adjust the same. a

of said normally movable means, one of said two elements of said assembly being rigid with re,- spect to said shaft and the other of said assembly being movable with, respect to said shaft in response to adjustments in a manner to force said movable members against said abutment. and lock said movable members in position and means for adjusting said cam and cam follower assembly to move the movable member thereof.

5. In a device of the character described, the

combination of a shaft, means for rotatably mounting said shaft, means "disposed between two regions of said shaft normally rotatable with respect to said shaft but adapted to he jammed tightly together for determining at least one pre-determined adjustment, and means for jamming said normally rotatable elements, said means including the following: an abutment at one region of said shaft,-iinmovablewith respect to said shaft along the axis of said shaft, and a cam and follower assembly at the other regionof said shaftand adapted to press said normally rotatable means against said abutment, said assembly including a. follower member rigid with respectto said shaft axis, said cam having-a cam surface providing a component of motion of said follower along said shaft axis and means for adjusting the relative positions of said cam and follower; r

6. The structure of claim 5 wherein said cam follower consists of a pin in said shaft and whereed by said pin.

7. In combination, a shaft, means for rotatably mounting said shaft, a control panel mounted in said cam member consists of a member straddling said shaft and having a cam'surface enparallel to said shaft and spaced therefrom,'a

plurality of means normally rotatable with respect to said-shaft but adapted to be clamped inadjusted position by side thrust, a manual means atsaid control panel for each of said normally rotatable means engaging the same for turning said normally rotatable means to a preto a pre-determined position, clamping means carried by said shaft and adjustable along-said shaft,'said means engaging saidnormally rotatable means to exert side thrust thereon, and means for adjusting said clamping means from a direction perpendicular to said shaft.

8. The structure of claim 7 wherein said clamp v ing means comprises a U-shaped member straddling saidshaft and having a cam slot therein and wherein said shaftis provided with a pin engaging said cam slot andwherein a set screw perpen- U-shaped determined positionand thus to turn said shaft 

